Rewinding device for magnetic sheets



N 1963 IKURO MORIYA REWINDING DEVICE FOR MAGNETIC SHEETS 2 Sheets-Sheet 1 Filed June 13, 1961 Nov. 12, 1 IKURO MORIYA 3, 0, 5

REWINDING DEVICE FOR MAGNETIC SHEETS Filed June 13, 1961 2 Sheets-Sheet z INVENTOR ATTORNEY United States Patent REWINDING DEVICE FOR MAGNETIC SHEETS Iknro Moriya, Yokohama, Japan, assignor to Victor Company of Japan, Limited, Yokohama, Japan, a corporation of Japan Filed June 13, 1961, Ser. No. 116,806 Claims priority, application Japan (lot. 22, 1969 1 Ciaim. (Cl. 242-55) This invention relates to a rewinding device for magnetic sheets in a magnetic recorder/reproducer wherein two or more magnetic heads are used to form a record track on the magnetic material-coated surface of a belttype sheet moving continuously in a substantially horizontal state. 1

An object of the present invention is to provide a rewinding device for magnetic sheets whereby a recorded belt-typemagnetic sheet can be rewound simply, easily and quickly by merely pushing a push-button as required in either recording or reproduction.

An embodiment of the present invention shall be explained with reference to the drawings in which:

FIGURE 1 is a plan view of an embodiment of the 3 present invention.

FIGURE 2 is a front View thereof.

FIGURE 3 is a side view thereof.

FIGURE 4 is a back view thereof.

In the drawings, 1 is a driving motor, 2 is a rotary shaft therefor and 3 is a rotary pulley connected with said rotary shaft 2 of the motor through a belt 4. 5 and 5' are coupling members provided on the inner surface of said rotary pulley, 6 being a rotary shaft therefor. A flywheel 7 is connected with said rotary shaft 6 through an idler 8. A coupling gear 9 is attached to said rotary shaft 6 so as to be freely rotatable independently of said shaft, separated resiliently from said rotary pulley 3 by means of a coil spring 10 and meshed constantly with an interlocking gear 11. Said interlocking gear 11 is secured at one end of a connecting shaft 12 and to the other end of shaft 12 is attached a small sprocket 13 connected through a chain 14 to a large sprocket 16 attached to a sheet holding shaft 15 supporting a wound tape-shaped magnetic sheet 20. There is provided a supporting plate 17 bearing said holding shaft 15. A supporting plate 18 is provided opposite said supporting plate 17 and has a sheet holding shaft 19 attached thereto so as to hold together with said sheet holding shaft 15 a winding shaft (not illustrated) for the belttype magnetic sheet 20 wound in the form of a roll. At 21 is represented a push-rod made movable up and down, having a push-button 22 secured to the upper end and provided on one side with a rod pin 23 and at the lower end with a projected finger 24 having a tapered surface 24'. An operating rod 25 is attached to a frame body 26 so as to be horizontally movable and pressed constantly at one end 25' against the projected finger 24 of said push-rod 21 by means of a spring 27. On the other hand, a roller 28 is rotatably provided at one end 25" of said operating rod 25 and is in contact with the side of said coupling gear 9. A crank 29 is pivoted near its bent portion to the frame body 26 by means of a shaft 39 and in contact at one end 29' with one end 31' of a connecting rod 31 and at the other end 39 with said rod pin 23.

Said connecting rod 31 is constantly pressed in the direction indicated by the arrow A in FIGURE 3. A cam 33 having a tapered portion 33' and a larger diameter portion 33 is attached to the other end of said connecting rod 31. A crank 34 is pivoted in the bent portion to the frame body 26 by means of a shaft 35 and has a rod pin 36 fixed to one end 34' so that said pin may be in contact with said connecting rod 31 from its upper side near its boundary with the tapered portion 33' 'of the cam 33 attached to one end of the rod 31. On the other hand, said crank 34 is in contact at one end 34" with a later mentioned operating shaft. A bearing 37 is formed integrally with the frame body 26 and bearing a worm wheel 38, gear clutch 39 and coupled gear 40. Said gear clutch consists of two connecting disks 39' and 39 having sprocket teeth made on the peripheries of the opposed surfaces and fixed to the worm wheel 38 and to the coupled gear 40, respectively. Further, their attaching shaft 41 is divided into a fixed shaft 41 to which are attached the connecting disk 39' and worm wheel 38 and an operating shaft 41" to which are attached the connecting disk 39" and coupled gear 40. The smaller diameter shaft 41" of said operating shaft is movably inserted into a through hole made in the axis of the fixed shaft 41 and is projected at one end from the fixed shaft 41' so that one end 34" of the above mentioned crank 34 may be in contact with the projected portion. A sheet spring 42 is constantly resiliently pressing one end of the operating shaft 41" against a ball 43. A worm gear 44 meshes with said worm wheel 38. A rotary shaft 45 is borne at both ends by the frame body 26, having sprocket wheels 46 and 47 fixed at both ends and a coupled gear 48 fixed in the intermediate part. Said coupled gear 48 is in mesh with said coupled gear 40. Driving sprocket teeth 46 and 47' provided on the peripheral surfaces of the sprocket wheels 46 and 47, respectively, fit perforations made on both sides of the belt-type magnetic sheet 20. Reference numerals 49 and 5t) denominate magnetic heads reciprocated alternately in the direction of the width of the belttype magnetic sheet 20 by a driving mechanism 51 connected with the flywheel 7.

Now, the operation of the magnetic recorder/reproducer provided with the device of the present invention shown in the drawings shall be explained. First of all, when the driving motor 1 is rotated, its torque will be transmitted to the driving mechanism 51 through the belt 4, rotary pulley 3, idler 8 and flywheel 7. In such case, the worm gear 44 will be rotated by the driving mechanism 51. By this rotation, the worm wheel 38, gear clutch 39, couled gear 49 and coupled gear 48 meshing with it will be rotated and the sprocket wheels 46 and 47 connected with said coupled gear 48 will be rotated at a fixed speed in the direction indicated by the arrow B shown in FIGURE 3.

Therefore, the belt-type magnetic sheet 20 whose perforations are fitted to the driving sprocket teeth 46' and 48' provided on said sprocket wheels 45 and 47, respectively, will be driven in the direction indicated by the arrow C in FIGURE 3. In such case, the magnetic heads '49 and 50 will be reciprocated in the direction of the width of the belt-type magnetic sheet 20 by said driving mechanism 51 so that any desired signals may be recorded on the sheet. After any desired magnetic recording is thus made on the magnetic sheet 20, in reproducing the record, it will be necessary to rewind said sheet so that the part at which the recording started may be returned back to the position of said magnetic heads 49 and 50. This rewinding can be easily effected by pushing down the push-button 22 while rotating the driving motor 1. Thus the push-rod 21 will be pushed down and the operating rod 25 will be moved in the direction indicated by the arrow D in FIGURE 2 by the tapered portion 24' made in the projected finger 24. Due to this movement, the roller 28 fitted to one end 25" of said operating rod 25 will press the coupling gear 9 on the side so that said coupling gear may be pushed onto one surface of the rotary pulley 3 against the resiliency of the coil spring 10 and the coupling members 5 and 5' made on said rotary pulley may be engaged with the coupling recesses 9' made on said coupling gear 9. Therefore, the coupling gear 9 will rotate, the coupled gear 11 meshing with it will rotate together with the coupling gear 9 and its rotation will be transmitted to the sheet holding shaft through the small sprocket 13, chain 14 and large sprocket 16. Thus the sheet holding shaft 15 will rotate in the direction indicated by the arrow B in FIGURE 3 and will be able to rewind the belt-type magnetic sheet borne thereon as wound in the form of a roll.

However, as said magnetic sheet has its perforations fitted to the driving sprocket teeth 46' and 47' of the sprocket wheels 46 and 47, respectively, rotating at a fixed speed in the direction indicated by the arrow B, it is necessary to disengage said gear clutch 39 so that the sprocket wheels 46 and 47 may rotate freely. The mechanism for disengaging the gear clutch 39 is apparent from FIGURES 3 and 4 and is to operate as operatively connected with said rewinding mechanism. That is to say, when the push-rod 21 is pushed down, one end 29 of the crank 29 will be pushed down, said crank will be thereby rotated clockwise around the shaft 30 as a center and the connecting rod 31 will be moved in the direction reverse to the direction indicated by the arrow A in FIGURE 3. The rod pin 36 attached to one end 34 of the crank 34 will be lifted upward by the tapered portion 33' and larger diameter portion 33" attached to one end of said connecting rod 31. Said crank will be rotated counterclockwise around the shaft 35 as a center. One end 34" of the crank will press the smaller diameter shaft 41" of said operating shaft 41' and the connecting disk 39' of the gear clutch 39 attached to said operating shaft will be separated from the other connecting disk 39".

Thus, said connecting disk 30", coupled gear 40, the other coupled gear 48 meshing with it and the sprocket wheels 46 and 47 will become freely rotatable in either direction. Therefore, even when the perforations of the belt-type magnetic sheet 20 are fitted to the driving sprocket teeth 46 and 47' of said sprocket wheels 46 and 47, respectively, the sheet will be able to be easily rewound independently.

As explained in the above, according to the present invention, an operating rod operatively connected with the vertical movement of a push-rod and a connecting rod are provided so that a coupling gear connected with a sheet holding shaft holding a belt-type magnetic sheet wound in the form of a roll may be engaged or disengaged with a rotary pulley rotated by a driving motor by the movement of said operating rod, and driving sprocket wheels for the belt-type magnetic sheet may be separated from or connected with their driving mechanism. Therefore, if only the driving motor is rotating, the magnetic sheet will be able to be simply rewound by only the operation of pushing the push-button in either recording or reproduction.

What I claim is:

A rewinding device for belt-type magnetic sheets comprising a frame body; a push rod fitted vertically movably to said frame body and provided with a projected finger having a tapered surface at the lower end, and a first rod pin on the side thereof; a connecting rod fitted to said frame body so as to be movable in the axial direction of the frame body; a spring normally pressing said connecting rod toward the side of one end of the connecting rod; a first crank having one end in contact with said end of said connecting rod and the other end in contact with said first rod pin, said first crank being pivoted in a bent portion to said frame body; a cam having a tapered portion and a large-diameter portion provided at one end of said connecting rod; a second crank having at one end a second rod pin in contact with said cam and pivoted to said frame body by a shaft; a rotary shaft rotatably borne on said frame body; sprocket wheels, mounted on said rotary shaft, for feeding a belt-type magnetic sheet; a gear clutch for connecting and disconnecting said sprocket wheels; a small-diameter shaft connected with an operating shaft for said gear clutch, said operating shaft being in contact with another end of said second crank; an operating rod in contact with the tapered surface of the projected finger provided on said push rod and horizontally movably fitted to the frame body; a roller fitted to one end of said operating rod; an axially movable idler in contact on one side thereof with said roller and having coupling recesses on the other side; a sheet-holding shaft holding said belt-type magnetic sheet, a rotary pulley having coupling members arranged in positions opposite the coupling recesses; said rotary pulley being connected through said idler pulley and a gear train to said sheet-holding shaft; and an electric motor rotating said rotary pulley.

References Cited in the file of this patent UNITED STATES PATENTS 

